#include <libssh2_sftp.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
    int rc = 0;
    LIBSSH2_SESSION *session;
    LIBSSH2_SFTP *sftp_session;
    const char *username = "username";
    const char *password = "password";
    const char *hostname = "hostname";
    const char *port = "22";
    const char *remote_dir = "/path/to/remote/directory";
    const char *local_dir = "/path/to/local/directory";

    session = libssh2_session_init();
    if (session == NULL) {
        fprintf(stderr, "libssh2_session_init failed\n");
        return 1;
    }

    rc = libssh2_session_set_log_level(session, LIBSSH2_LOG_PROTOCOL);
    if (rc != 0) {
        fprintf(stderr, "libssh2_session_set_log_level failed\n");
        return 1;
    }

    rc = libssh2_session_init_ex(session, NULL, NULL, NULL);
    if (rc != 0) {
        fprintf(stderr, "libssh2_session_init_ex failed\n");
        return 1;
    }

    rc = libssh2_session_handshake(session, hostname);
    if (rc != 0) {
        fprintf(stderr, "libssh2_session_handshake failed\n");
        return 1;
    }

    // Authenticate with the server.
    libssh2_userauth_list(session, username, password);
    if (libssh2_userauth_list(session, username, password)) {
        fprintf(stderr, "Authentication failed\n");
        return 1;
    }

    sftp_session = libssh2_sftp_init(session);
    if (sftp_session == NULL) {
        fprintf(stderr, "libssh2_sftp_init failed\n");
        return 1;
    }

    // Open the remote directory.
    LIBSSH2_SFTP_HANDLE *handle;
    handle = libssh2_sftp_open(sftp_session, remote_dir, LIBSSH2_SFTP_S_IRUSR | LIBSSH2_SFTP_S_IWUSR | LIBSSH2_SFTP_S_IXUSR | LIBSSH2_SFTP_S_IRGRP | LIBSSH2_SFTP_S_IROTH | LIBSSH2_SFTP_S_IWOTH | LIBSSH2_SFTP_S_IXOTH, 0);
    if (handle == NULL) {
        fprintf(stderr, "libssh2_sftp_open failed\n");
        return 1;
    }

    // List the contents of the directory.
    struct libssh2_sftp_statvfs_result vfs;
    rc = libssh2_sftp_statvfs(handle, &vfs);
    if (rc != 0) {
        fprintf(stderr, "libssh2_sftp_statvfs failed\n");
        return 1;
    }

    printf("Total file count: %d\n", vfs.f_bcount);

    // Compare the local and remote directories.
    // You can use a function like this to compare the contents of two directories:
    // https://stackoverflow.com/questions/972762/how-to-compare-the-contents-of-two-directories-in-c
    // Then, you can use the results to synchronize the directories.

    // Close the handle and end the SFTP session.
    libssh2_sftp_shutdown(sftp_session);
    libssh2_session_disconnect(session, "Goodbye");

    return 0;
}